Bike Gear Shifter

What does this shifter on the left handlebar of my bike do?
I have a shifter with gear numbers on the right of my bicycle and then there is one on the left of it that just have lines on it what does that one do i have a mountain climber sport from roadmaster
well the left controls the chain ring gears usual 1-3 mountain,1-2 gears road bike and the right shifter controls the back cog/gears range from 1-9 gears hope i help
Bike gear shift problems
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